Difficult sudoku #844
| 6 | 9 | |||||||
| 3 | 1 | 5 | ||||||
| 6 | 5 | 8 | ||||||
| 2 | 5 | 4 | 6 | 7 | ||||
| 7 | 4 | |||||||
| 2 | ||||||||
| 7 | 2 | |||||||
| 1 | 6 | |||||||
| 5 | 3 | 2 | 4 |
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